This math practice page focuses on developing kids' skills in understanding and solving equivalent fractions where one denominator or nominator is given the letter n. For example, you can use cross-multiplication to solve the equation 5/2 = n/16. Cross multiply to eliminate the denominators: 5 x 16 = 2 x n. This simplifies to 80 = 2n. Solve for n by dividing both sides of the equation by 2. This results in n = 40. Encourage kids to check their answers. In this example, they would check by calculating 5/2 as 2.5 and 40/16 as 2.5.